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$Lightweight Silica Brick_Silica Insulating Refractory Brick_Glass Furnace Hot Blast Stove_0.6-1.2g/cm³ Six Grades_Hubei Zhongnai$ $Lightweight Silica Brick_Silica Insulating Refractory Brick_Glass Furnace Hot Blast Stove_0.6-1.2g/cm³ Six Grades_Hubei Zhongnai$ $Lightweight Silica Brick_Silica Insulating Refractory Brick_Glass Furnace Hot Blast Stove_0.6-1.2g/cm³ Six Grades_Hubei Zhongnai$ $Lightweight Silica Brick_Silica Insulating Refractory Brick_Glass Furnace Hot Blast Stove_0.6-1.2g/cm³ Six Grades_Hubei Zhongnai$

Lightweight Silica Brick_Silica Insulating Refractory Brick_Glass Furnace Hot Blast Stove_0.6-1.2g/cm³ Six Grades_Hubei Zhongnai

Lightweight silica bricks, also known as silica insulating bricks or silica refractory bricks, are lightweight refractory materials with silica content above 89% and bulk density below 1.2g/cm³. Their refractoriness and refractoriness under load are not significantly different from ordinary silica bricks of the same composition, but due to high porosity, their compressive strength, slag resistance, and corrosion resistance are inferior to ordinary silica bricks, while thermal shock resistance is significantly improved.

Key words:

lightweight silica brick

silica insulating brick

silica refractory brick

glass furnace insulation

hot blast stove refractory

industrial insulation brick

energy saving insulation

Classification:

Refractory brick

Refractory materials for metallurgical industry

Refractory materials for cement industry

Refractories for glass industry

Refractory materials for non-ferrous industry

Refractory materials for power industry

Insulation Refractory Brick

Product inquiry

Lightweight Silica Brick · Silica Insulating Refractory Brick

Glass Furnace Hot Blast Stove Specialized Refractory Brick · 0.6-1.2g/cm³ Six Grade Products

Ultra-Low Thermal Conductivity 0.22W/(m·K) YB/T 386-2020 Standard Porous Structure Design Excellent Thermal Shock Resistance Hubei Zhongnai New Material

Product Overview

Lightweight silica bricks, also known as silica insulating bricks or silica refractory bricks, are lightweight refractory materials with silica content above 89% and bulk density below 1.2g/cm³. Their refractoriness and refractoriness under load are not significantly different from ordinary silica bricks of the same composition, but due to high porosity, their compressive strength, slag resistance, and corrosion resistance are inferior to ordinary silica bricks, while thermal shock resistance is significantly improved.

Bulk Density Range: 0.6～1.2g/cm³ (Complete six grades)
Operating Temperature Range: 1200℃～1640℃
SiO₂ Content: 89%～92%, refractoriness under load similar to ordinary silica bricks
Porous Structure Design: Excellent thermal shock resistance
Ultra-Low Thermal Conductivity: Grade 0.6 as low as 0.22W/(m·K)@400℃
Primary Applications: Insulation or weight reduction where not in direct contact with molten materials

Product Grade Specifications

Item/Grade	Grade 0.6	Grade 0.8	Grade 1.0	Grade 1.1	Grade 1.15	Grade 1.2
ω(SiO₂) ≥/%	89	90	92	91	91	92
Fe₂O₃ ≤/%	0.62	0.52	0.57	0.58	0.58	0.60
CaO ≤/%	3.3	3.0	2.7	2.8	2.6	2.5
Bulk Density/(g/cm³)	0.6	0.8	1.0	1.10	1.15	1.2
Cold Crushing Strength/MPa	2.5	3.0	4.5	3.0	5.0	5.0
Refractoriness/℃	1600	1610	1620	1420	1500	1640
Thermal Conductivity@400℃ [W/(m·K)]	0.22	0.26	0.30	0.60	0.65	0.36
High-Temp Cold Crushing Strength≥/MPa	18	15	8	-	-	6

Product Advantages

Porous Structure Design

High porosity structure provides excellent thermal insulation and significantly reduces heat loss

Ultra-Low Thermal Conductivity

Grade 0.6 as low as 0.22W/(m·K)@400℃ for exceptional insulation performance

Complete Grade System

Six bulk density grades from 0.6～1.2g/cm³ meeting various application requirements

Excellent Mechanical Properties

Cold crushing strength 2.5～5.0MPa, high-temperature strength 6～18MPa

High Refractoriness

Refractoriness 1600～1640℃ suitable for high-temperature industrial applications

Excellent Thermal Shock Resistance

Due to porous structure, thermal shock resistance is significantly improved compared to ordinary silica bricks

Thermal Conductivity Temperature Characteristics

Grade	400℃	600℃	800℃	1000℃
Grade 0.6	0.22	0.25	0.28	0.31
Grade 0.8	0.26	0.29	0.31	0.34
Grade 1.0	0.30	0.33	0.36	0.39
Grade 1.2	0.36	0.39	0.41	0.44

Performance Analysis: Grade 0.6 has the lowest thermal conductivity, providing the best insulation performance at all temperatures; As temperature increases, thermal conductivity of all grades increases; low-density grades maintain excellent insulation performance at high temperatures.

Applications

Glass Industry - Primary Application

In glass melting processes, temperatures reach around 1600℃ at the lower part of the furnace crown protrusion. Lightweight silica bricks are mainly used for furnace crown insulation, reducing heat loss and increasing melting process efficiency. The lightweight layer is usually designed as two or more layers.

Steel Industry - Important Application

Lightweight silica bricks are used for lightweight construction of hot blast stove walls and domes. Hot blast stove temperature ranges between 1000～1300℃, with hot air flow rates in the range of 2300～6500m³/min.

Petrochemical Industry

Petrochemical furnace insulation layers, cracking furnace insulation, catalytic cracking unit insulation sections

Building Materials Industry

Ceramic tunnel kiln insulation layers, shuttle kiln insulation layers, cement rotary kiln insulation

General Industrial Furnaces

Heat treatment furnace insulation, forging heating furnace insulation, non-ferrous metal smelting furnace insulation layers

Industry Application Selection Guide

Industry Application	Recommended Grade	Refractoriness	Key Advantages
Glass Furnace Crown Lower Insulation	Grade 0.6	1600℃	Ultra-low thermal conductivity 0.22W/(m·K)
Glass Furnace Crown Middle Insulation	Grade 0.8	1610℃	Balance of insulation and structural stability
Glass Furnace Crown Dense Layer	Grade 1.0	1620℃	Similar expansion properties to dense silica bricks
Hot Blast Stove Lightweight Layer	Grade 1.2	1640℃	Highest refractoriness, excellent mechanical properties
General Industrial Furnace Insulation	Grade 1.1-1.15	1420-1500℃	Standardized products, cost-effective

Usage Limitations and Precautions

Mainly used for furnace sections requiring insulation or weight reduction where not in direct contact with molten materials, not subjected to corrosive gas action, and not experiencing sudden temperature changes. When used at high temperatures, cannot contact with alkaline refractory materials. Suitable for acidic or neutral environments, avoid sudden temperature changes, gradual heating and cooling.

Technical Standards & Certifications

Product Standard: YB/T 386-2020 "Silica Heat-Insulating Refractory Bricks"
Test Standard: GB/T 32833-2016 "Test Method for Spalling Resistance of Heat-Insulating Refractory Bricks"
Raw Material Control: Finely crushed silica stone, critical particle size ≤1mm, particles <0.5mm ≥90%
Pore Formation Process: Adding combustible substances or using gas generation method to form porous structure
Quality Assurance: Strict control of porosity and bulk density to ensure stable performance

Hubei Zhongnai New Material Technology Co., Ltd.

Professional Lightweight Silica Brick (Silica Insulating Refractory Brick) Solutions Provider

All technical parameters comply with Chinese national standard YB/T 386-2020 "Silica Heat-Insulating Refractory Bricks" and related standards, ensuring stable and reliable product quality. For custom specifications or technical consultation, please contact our technical team.

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